Crane, and method and device for controlling super-lifting derricking oil cylinder thereof

Abstract

The invention provides a crane, and a method and device for controlling a super-lifting derricking oil cylinder of the crane. The control method comprises the following steps of: acquiring a first included angle between a super-lifting mast and a lifting arm of the crane and a second included angle between the lifting arm and a horizontal plane in real time; calculating a real-time oil pressure for overcoming the self weight of the super-lifting mast when the lifting arm is in the second included angle and the super-lifting derricking oil cylinder is in the first included angle; and setting a safe working pressure of the super-lifting derricking cylinder in real time according to the real-time oil pressure. According to the method provided by the invention, the safe working pressure of the super-lifting derricking oil cylinder is set according to the real-time oil pressure corresponding to the first included angle and the second included angle, so that the pressure value of the super-lifting derricking oil cylinder does not need to be kept in a maximum working pressure state of the system, deformation of structural components such as super-lifting pedestals or accidents caused by pressure surge of the system due to unexpected circumstances can be prevented, a super-lifting structure does not need to be designed large, and the lifting capability of the whole crane is improved.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a control method and device for a crane and its super-lift luffing oil cylinder. Background technique [0002] In order to increase the lifting capacity of the crane and improve the stress condition of the boom, a super-lifting device is often added at the end of the telescopic boom. For the hoisting conditions that require super-lifting auxiliary operations, the super-lifting device must first be installed, and the super-lifting mast is transformed to a position at an angle of 90° to the boom under the action of the super-lifting luffing cylinder. In the process of installing the super-lifting device, the boom should be put down first, and then the super-lifting device should be connected to the boom. When the mast is super-lifted, the position is maintained, and then the boom is luffed to the hoisting state. [0003] During the luffing stage of the super-lifting mast, the angle between ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a control method and device for a crane and its superlift luffing cylinder, which can monitor the working pressure of the superlift luffing cylinder, so as to solve the need in the prior art to design the superlift structure larger than Avoid the deformation of structural parts such as the super-lifting base, which leads to the reduction of the lifting capacity of the whole vehicle

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